Error Code E1 indicates an open circuit in the temperature monitor. This is not user-serviceable.
- Unplug the air fryer.
- Allow it to cool completely for 30 minutes.
- Plug it back in and see if the error persists.
IF THAT DIDN'T WORK: If E1 displays again immediately, contact Cosori Customer Support. Do not attempt to use or repair the unit yourself.
HEADS UP: Other error codes: E2 is a short circuit in the temperature monitor. E3 means overheat protection activated—unplug and let cool. E4 means you plugged into a 220-240V outlet; only use 120V, 60Hz. For E2, E3 (if it remains after cooling), or E4, contact support.